Sheet margin stop for duplicators



Nov. 29, 1938.. F. w. STORCK 2,138,682

SHEET MARGIN STOP FOR DUPLICATQRS Filed Sept. 16, 1937 5 Sheets-Sheet lNov. 29, 1938. F. w. STORCK SHEET MARGIN STOP FOR DUPLIGATORS 'FiledSept. 16, 1937 5 Sheets-Sheet 2 New. 29, N3.

F. w. STORCK SHEET MARGIN STOP FOR DUPLICATORS 5 Sheets-Sheet 5 FiledSept. 16, 1937 New. 29, W38. F. W. STORCK SHEET MARG'IN STOP FORDUPLICATORS Filed Sept. 16, 1957 5 Sheets-Sheet 4 Nov. 29, 1938. w s o c$138,682.

SHEET MARGIN STOP FOR DUPLICATORS Filed Sept. 16, 1937 5 Sheds-Sheet 57' M Q Z wderzlck W60 7-021 Patented Nov. 29, 1938 PATENT OFFICE SHEETMABJGIN STOP FOR DUPLICA'I'ORS Frederick W. Storck, Arlington, Masa,assignor to Standard Mailing Machine Company, Everett, Mass., acorporation of Massachusetts Application September 16,1937, Serial No.164,194

8Claims.

This invention relates to duplicating machines and is particularlyadapted to be associated with rotary duplicators of a character in whichadhesive gelatin bands are-provided to receive impressions from a mastercopy and wherein these impressions are subsequently duplicated on blanksheets of paper, or the like, that are brought into contact underpressure with the gelatin medium, and the present invention specificallyrelates to a margin stop and sheet positioning device that is adapted toposition the advance end of the sheet in a manner that provides a freemarginal advance end when the sheet is operatively engaged with theadhesive gelatin duplicating medium.

The use of a gelatin medium adapted to receive an impression in reverse,or negative, of matter to be copied and a positive duplicate copy madetherefrom by bringing the sheets of paper, or the like, into contacttherewith is common and well-known in the duplicating art.

A rotary duplicator of the herein referred to character is shown anddescribed in my United States Letters Patent No. 1,926,317. Theduplicator disclosed in this patent, as in the present instance, isprovided with an opening or space in the peripheral face of the drumthat permits positioning the advance. end portion of the sheet so thatit will be free from operative engagement when the adhesive gelatin filmengages with the sheet. This free end of the sheet is essential topermit of the sheet being subsequently stripped fromthe gelatin afterthe duplicating operation has been completed.

Since the disclosure contained in my Patent No. 1,926,317 it has becomewell known that the required free end of a sheet may be effected byproviding an opening in the peripheral face of the drum and utilizing ashoulder of 'the gelatin, closely adjacent the drum opening, to engagewith the sheet, beyond the free margin thereof, for the purpose ofadvancing the sheet for operative engagement with the duplicator film orband.

I am aware that various devices have been provided for feeding a sheetsingly from a stack to a duplicator, and a feeding device of thischaracter that is particularly well adapted to be substantiallyassociated with the present invention isv shown and described in theco-pending application of Frederick W. Storck and'Carl V. Franv sheet isengaged with and further advanced in operative engagement with theduplicating medium.

Another particular object of the invention is to provide a novel sheetguiding means actuated in a timed relation with the rotation of the drumto direct the leading edge of a sheet into a positioned relation and tofurther press a portion of the sheet into operative engagement with theduplicating medium.

A further object is to provide a combined sheet guiding, positioning andpressing device of a simple construction with few working parts thatwill positively position the advance and of the sheet so that the sheetwill register for engagement with the duplicating medium.

With the above and various other objects in view, the invention mayconsist of certain novel features of construction and operation as willbe more fully described and particularly pointed out in thespecification, drawings and claims appended hereto and forming a parthereof.

In the drawings, I have illustrated a preferred embodiment of myinvention sumcient to enable those skilled in the art to understand theconstruction and operation thereof with reference to the followingdescription in which like reference characters are used to designatelike parts.

Referring to the drawings:

Fig. 1 is a plan view of a rotary duplicating machine having myimprovements embodied therewith.

Fig. 2 is a sectional elevation taken substantially along line 2-2, Fig.1.

, Fig. 3 is a view corresponding to Fig. 2, but shows some of the partsin a different position.

Fig. 4 is another sectional elevation corresponding. substantially toFigs. 2 and 3, but shows some of the parts in still another position.

Fig. 5 is a transverse section taken substantially along line 5--5, Fig.4, and

Fig. 6 is a detail of the machine drive gear- The duplicating machine Asillustrated by the drawings, the machine is provided with opposed sideframes III, II that are retained in spaced relation by suitable tierods. The suporting shaft I3 is rotatably mounted in suitable bearingsin the opposed side frames and has a gear I4 secured thereto. This gear|4 meshes with and is rotated by an intermediate gear l5 which isrotatably supported on a stud l5 secured in the side frame ID. Theintermediate gear l5 meshes with a driving gear |1 secured on a studshaft l3 rotatably supported in the side frame It. In this instance theouter end of the stud shaft l3 has an operating crank |8a securedthereto and by which the driving mechanism may be actuated, but it isobvious that other means may be employed as a prime mover.

The printing platen or drum indicated generally at I3 is provided withopposed end walls 20, 2| that are adapted to engage with and support thesegmental face plate 22 of the drum, the drum being retained inassembled relation by suitable tie rods. This segmental face plate 22effects an opening in the peripheral face of the drum and thelongitudinal edges of the plate 22 are bent inwardly, the edge 22a beingprovided with suitable means for engaging with one end of a fabric strip23 that supports the gelatin 4. or like duplicating medium. One end ofthe fabric strip having been attached to the shoulder edge 22a, thestrip is then passed over the face plate 22 and the other end of thestrip is attached over the shoulder edge 22b by a suitable tensioningdevice 24 and by which the strip 23 is drawn tightly into engagementwith the face plate 22.

It will be observed from the drawings that the face plate 22 in thisinstance covers slightly more than one-half of a full circumference,although this may be varied without substantially affecting the purposeof the opening, as will be hereinafter more fully pointed out. Thisopening in the drum is, however, clmed by a substantially inset curvedplate 25, the radius of curvature of which is less than the radius ofcurvature of the face plate 22. This curved plate 25 is secured to thedrum tie rods 26 in any suitable manner. Adjacent one end of the plate25 is a row of slots or recesses 21 through which slots or recessesextend the stripping guide fingers 29 that, in this instance, areintegral parts of a plate 29. This plate 29 is provided with a U- shapedportion 29a that engages with the shaft i3 and the opposed side edges ofthe plate 29 are each provided with a cam roller 30 that engages withthe peripheral face of actuating cams 3| secured to the shaft l3. Thecam rollers 30 are retained in engagement with the face of the cams 3|by means of a pull spring 32 having one end secured to the U-shapedportion 29a, of the plate 29, and its opposed end fixed to one of thedrum tie rods 320.

Sheet stripping device Extending transversely between the side framesand rotatably mounted therein is a shaft 33- which has attached theretoa suitable roller 34. This shaft 33 is also provided with a gear 35 thatI meshes with and is driven by a gear 36 rotated with the printingplaten or drum l9. Coacting with the roller 34 is a second rotatableroller 31 which is preferably provided with a knurled peripheral faceand spaced apart grooves 31a adapted to permit the guide fingers 38 toextend inwardly between the stripper rollers 34, 31 and adjacent thebight formed between these rollers 34, 31.

Sheet feeding device Associated with the duplicating machine is a stackof sheets 39 supported upon a base 40 that is provided with opposedupwardly extending flanges 40a, 43b and a front stop 400 that ispreferably disposed at' an angle of substantially 30 from the end faceplane of the stack or at an angle 'so disposed that sheets havingadvance ends inclined to curl downwardly will not buckle against thisstop 400 as the sheet is advanced from the stack. The flanges 40a, 4317are adapted to engage with a transverse rod 4| that acts as a supportfor the front end of the base 43. Pivotally secured to the base 4|) is aknee brace 42 having its lower end provided with a U-shaped slot 42a.that engages with one of the frame tie rods 43 in a manner to supportthe rear end of the base. These supports for the base 43 may obviouslybe constructed so as to permit a ready removal of the base from themachine. One of the side flanges 43a is cut away so as to permit theside friction device generally indicated at 44 to contact with the sideedge of the stack 39. The illustrated mechanism for advancing a sheetfrom the stack 39 includes a pair of rollers 45, 43 formed of a suitablefrictional material. These rollers 45, 45 are secured on a shaft 41 thatis rotatably supported in a suitable bracket 43 which, in turn, has itsbearing 43b mounted with a limited rotative movement upon one end of anangle rod 49.

The roller shaft 41 has a ratchet wheel also secured thereto which isadapted for engagement with a ratchet dog 5| pivoted in the roller shaftbracket 43. This ratchet wheel 50 and its coacting dog 5| are of aconventional design and are adapted to permit free rotative movement ofthe roller shaft 41 and its attached elements in the direction of arrowa, Fig. 2 and to arrest rotative movement of these elements in thedirection of arrow b.

The opposite end of the angle rod 49 is mounted with a limited rotativemovement in a bearing 52a of a member 52 which, in turn, is adjustablysecured on a trunnion 53a forming a part of the feed oscillating lever53. The lower end of the lever 53 is pivotally mounted on one of theframe cross rods 43 and this lever 53 is oscillated by means of a pitman54 having one end pivoted at 55 to the lever 53 and its opposed endengaging with a crank disc 55 that is associated with the intermediatedriving gear l5.

Various forms'of sheet feeding devices may be utilized with the presentinvention and such devices are now known and used and a sheet feedingdevice corresponding substantially to the above is completely shown anddescribed in the previously referred to co-pending application,therefore, detailed description of the means for advancing a sheetsingly from the stack of sheets is thought to be unnecessary.

Sheet guiding and positioning device To guide the advance marginal endof a sheet to its registering position, I have provided a guide platethat is attached to a transverse bar 5| rockably mounted in suitablesupports in the opposed side frames. This bar 6| has a cam lever 62secured thereto that is provided with a cam roller 63 adapted forcontinued engagement with an actuating cam 34 secured to the drum shaftI3.

The guide plate 60 is provided with fingers 53a adapted to engage in andextend through suitable circumferential openings in the stop plate 25,see Fig. 3, the stop plate supporting rods being notched so as to permitthe fingers 50a to remain in operative position during a rotativemovement of the drum.

end of said sheet and position said sheet for oper- Operation by whichit is directed so that its front edge engages with the stop plate 25.The fingers 60a of the guide plate retain the front edge of the sheet inpositioned engagement between the guide plate 60 and the stop plateduring rotative movementof the drum.

It is to be noted that in Fig. 4, the front end of the sheet is shown inits positioned relation, but in this view the front end is spaced fromthe inner face of the guide plate 60 merely for illustrative purposes,as normally the sheet end will follow the contour of and engage with theinner face of the guide plate 60.

The guide plate 60 remains in operative position as the drum shoulder22a advances, in the direction of the arrow, and the adhesive shoulderof the gelatin band engages with the positioned sheet, see Fig. 4, theplate 60 acting to press a margin of the sheet into operative engagementwith the gelatin and after which the cam 6Q actuates the guide plate 60and fingers 60a to their inoperative position as shown at Fig. 2.

After a margin of the sheet has been engaged with the gelatin shoulder22a, the sheet is further withdrawn thereby as the drum I9 continues itsrotative movement and, as the sheet becomes engaged between the drum i9and its coacting pressure roller I911, it is pressed into operativeengagement with the gelatin duplicating medium and with an advance endportion of the sheet free.

As the drum continues its rotative movement, the stripping guide fingers28 are actuated to engage with the free end of the sheet and direct thisend into the bight of the stripping rollers 35, 3'? and by which thesheet is stripped from the duplicating medium, during continued rotationof the drum i9, and directed into a suitable receptacle 65.

While the machine .functions have been described separately, it is tobeunderstood that the present machine is so adapted that these functionsare performed in sequence during a continuous rotation of. theprinting-platen or drum i9.

Having thus described my invention, what I claim is:

1. In a duplicating machine, -a printing drum, means for rotating saiddrum, an opening in the peripheral face of said,drum and extendinglongitudinally therein, a member carried by said drum and disposed insaid opening and in a radially spaced relation to the printing surfaceof said drum, a guide member adapted to coact with said first memberwith means for rocking said guide, member into and out of saiddrumopening in a timed relation to therotative, movement of said drum, apressure roller adapted for'engagement' with the peripheral face of saiddrum, a copy sheet support with means for advancing the forward end ofasheet on said support into said drum opening and against said firstmember during a continuous rotation of said drum and whereby said firstmember and said guide member coact to form a margin stop for the advanceative engagement with said printing drum.

2. In a duplicating machine having a printing drum and a pressurerollerv coacting with. said drum and means for rotating said drum andrroller,-together with means for advancing a sheet to be duplicated uponto said printing drum; a marginal stop for the advance end of said sheetthat includes an opening in the peripheral face of .said drum andextending longitudinally therein, an arcuate member carried by said drumand disposed in said drum opening and in a spaced relation to the normalperipheral face of said drum, ,a guide member pivotally associated withsaid drum and adapted to coact with said arcuate member and direct theforward edge of an advancing sheet thereagainst, means to actuate saidguide relative to said drum opening and said arcuate member.

3. In a duplicating machine having a printing drum and a. pressureroller coactlng with said drum and means for rotating said drum androller, together with means for advancing a sheet to be duplicated uponto said printing drum; a marginal stop for the advance end of said sheetthat includes an opening in the peripheral face of the drum andextending longitudinally therein, a fixed member disposed in said drumand relative to said opening, a guide member normally disposed beyondthe periphery of said drum and, when in operative position, associatedwith said fixed member whereby the forward end of an advancing sheet ispositioned against said fixed member with means for moving said guidemember into and out of operative position relative to the rotative cycleof said printing drum.

4. In a duplicating machine, a rotatable drum having an opening in itsperipheral-face and extending longitudinally therein, a duplicating bandsecured on the face of said drum and extending into said opening, meansfor advancing a sheet into said opening for engagement with saidduplicating band, a marginal stop for the advance end of said sheet,said stop being operatively positioned in said opening and including amember fixed within said drum in spaced relation to said opening. aguide member adapted to cooperate with said fixed member with means formoving said guide member into and out of operative position and in atimed relation to the rotative movement of said drum and whereby theadvancing edge of a sheet is guided to engage with said stop andretained in its positioned relation during 'a rotative movement of saiddrum, said guide, when operatively positioned, being effective to causea portion of the positioned sheet to engage with and be further advanced for operative engagement by said duplicating band and with a freeadvance marginal end.

5. In a duplicating machine, a rotatable drum having an opening in itsperipheral face and extending longitudinally therein,

tending into said opening, means for rotating said drum, a support forsheets to be duplicated upon with means associated with said support foradvancing a sheet therefrom into said drum opening and to urge theforemost edge thereof against a margin stop associated with said drum,

I I a duplicating band secured to the face of said drum and exsaid drum,said guide being adapted to cooperate with said gauge member and retainthe foremost edge of said sheet in its positioned engagement with saidgauge during a portion of the rotative cycle of said drum, with meansincluding said guide whereby a portion of the, positioned sheet, beyond.the margin thereof,. is pressed into engagement with said duplicatingband adjacent the drum opening whereby said sheet is further advancedfor operative engagement with said duplicating band a with a freeadvance marginal end.

6. In a duplicati g machine, a frame, a printing drum rotatably mountedin the frame, an opening in the peripheral face of said drum with meansfor advancing a forward marginal end of a sheet into said drum opening,a rockable juxtapositioned margin guide for the forward end of saidsheet with means for actuating said guide into and out of said drumopening with means cooperating with said guide to position the advanceend of said sheet, said guide being disposed to operatively engageaportion of the positioned sheet with said drum as said drum is rotated.

7. In a duplicating machine, a frame, a printing drum rotatably mountedin the frame and having an opening in the peripheral face thereof,

a support for a stack of sheets to be duplicated upon and having itsfront end portion disposed adjacent the periphery of said drum, andmeans for advancing a sheet from said stack with a forward marginal endof said sheet engaging in said drum opening, a rockabie margin guidejuxtapositioned relative to the front end of said stack, with cam meansfor actuating said guide to its functionally operative and inoperativepositions and, when in operative position, said guide being disposed toope'ratively engage a portion of the sheet with said drum as said drumis rotated.

8. In a duplicating machine, a frame, a printing cylinder rotatablymounted in said frame and provided with a gelatin duplicating medium, an

opening inthe peripheral face of said cylinder,

means to advance the forward end portion of a sheet into said drumopening, a margin guide juxtapositioned relative to said sheet advancingmeans and adapted to engage with and direct the forward end of the sheetto registering position in said drum with means for actuating said guideto its functionally operative and inoperative positions and, when inoperative position, said guide being disposed to operatively engage aportion of said sheet with said cylinder as said cylinder is rotated.

FREDERICK 'W. STORCK.

